Keyboard



FIG. 1 is a perspective view of a first embodiment;

FIG. 2 is a top plan view of the first embodiment;

FIG. 3 is a bottom plan view of the first embodiment;

FIG. 4 is a rear elevational view of the first embodiment;

FIG. 5 is a front elevational view of the first embodiment;

FIG. 6 is a right side elevational view of the first embodiment; and,

FIG. 7 is a left side elevational view of the first embodiment.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 